At about the time I started getting into top cupcake mode, ostensibly for children, I noticed that the people who really seemed to get excited by them were the children's parents. Instant Royal Icing can be tricky to find in the US, in which case you can make your own Royal Icing by mixing a 1lb box of confectioners' sugar with 3 tablespoons of meringue powder. Add 6 tablespoons of warm water and beat with an electric mixer on low speed until the icing has thickened and forms soft peaks. For US cup measures, use the toggle at the top of the ingredients list.